.startshop_img{
    display: flex;
    margin: 0 auto;
    text-align: center;
}
.msui_nav,.nav{
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    z-index: 10000;
}
.weui-top{
    position: absolute;
    margin-top: 2.4rem;
    top: 0;
    right: 0;
    left: 0;
}